P-vortices, nexuses and effects of Gribov copies in the center gauges

Abstract

We perform the careful study of the Gribov copies problem in SU(2) lattice gauge theory for maximal direct and maximal indirect center projections. We find that this problem is much more severe than it was thought before. The projected string tension is not in agreement with the physical string tension. We also show that the particle--like objects, nexuses, might be important for the confinement dynamics.

8 pages, 1 figure, Talk given at the International Symposium on Quantum Chromodynamics and Color Confinement (Confinement 2000), Osaka, March 2000